Process of making bifocal lenses.



E. C. MORINE.

PROCESS OF MAKING BIFOCAL LENSES.

APPLICATION FILED OCT. 20. 1911.

1,157,410, Patented Oct. 19, 1915.

3&1 I dHozucuS be used to produce the major lens;

HE s'ra'rns earns EDWI IIN C. MORINE, OF NEW YORK, N. Y., ASSIGNOR, BYMESNE ASSIGNMENTS, T0

- KRYPTOK COMPANY, OF NEW YORK, N, Y A CORPORATION OF NEWYORK.

- EROCESS OF MAK ING BIFOCAL LENSES.

Specification of Letters Patent.

Patented flct. 19, 1915.

To all whom it may concern:

Be it known that LEDWIN C. MORINE, of New York, in the county of NewYork, and in the Stateof New York, have inventeda certain new and usefulImprovement in Processes of Making Bifocal Lenses, and do hereby declarethat the following is a full, clear, and exactdescription thereof.

My invention relates particularly to manufacturing bifocal lenses of atype where the lens for near vision is welded into a recess or cavity inthe lens used for far vision.

In the methods now used for manufacturing bifocal lenses of this type,great difliculty has-arisen in preventing the formation of air-bubblesin the body of the united bifocal lenses between the major andminorlenses, owing to the fact that the blank used for near vision whichis to be Welded into a corresponding cavity in the blank used for farvision is thinner at the edge than it is at the center, and thattherefore,

the ed es of the small blank become plastic first, tl tween the twoblanks.

In accordance with my invention, I provide a blank designed to be usedto produce the major lens element with a groove or canal, leading fromone edge of the blank to a point near the lower part of the cavityprovided in the main. blank. The presence of this groove permits thecontinual escape of air while the welding operation is going on and inthe subsequent finishing of the bifocal lenses, the portion of theblank'carry- 'ing the groove is ground away.

In the accompanying drawings, 1 have shown blanks in various stages ofdevelop- .ment in accordance with my process, in

Which Figure 1 represents a blank desig ed to Fig. 2 represents a blankto be usedto produce the minor lens; Fig. 3 shows the manner of applyingthe minor lens element to the major lens element at the beginning ofthewel fu ed bifocal blank showing the groove in one position, and Fig.5.is a similar view of a blank showing the use of a plurality of suchgrooves.

ereby trapping a quantity of air beoperation; Fig. 4 is a plan view ofthe.

In the drawings, 1 indicates a blank designed to be used to produce themajor lens element, said blank having a cavity or depression 2.

3 represents a blank designed to be used for producing the minor lenselement. It

will be noted'that the blank 1 is provided with a groove or canal 4which extends to the edge of the blank ljfrom a point near the bottom ofthe depression 2. As shown in Fig. 4, I may make use of only one suchgroove on canal, or as shown in Fig. 5, I may make use of a plurality ofsuch grooves 4. In the process of welding the two blanks together, thesmall blank 3 is superimposed upon theblank -1 at a point abovethecavity or depression 2 and the parts are-subjected to sufficient heat tocause the blank 3 to fill the cavity or depression 2. During the weldingoperation, the air contained in the cavity or depression 2 is forcedoutwardly through the canal or canals 4: until the depression or cavityis entirely filled. In the subsequent finishing of, the fused bifocalblank, the portion carrying the groove or grooves 4 is entirely cutaway, as shown in dotted lines in Figs. 4: and 5. While I have describedmy, process above in detail, I wish it to be understood that manychanges may be' made thereinwithout departing from the spirit of myinvenassembled elements until they are welded together, whereby airbetween the elements will be permitted to escape through the canalduring the welding operation.

In testimony that I claim the foregoing I have hereunto set my hand.

EDWIN G. MORINE. Witnesses:

Moses H. HARRIS, MINERVA Lonnn.

